Oh btw, you can also put them in a Mapcontrib environment, where you can stimulate your contributor to fix stuff by showing it with a prettier icon.
In the example, stuff in red is "wrong", stuff in white is "correct". You'll have to zoom to the UK, Belgium or Germany to see some stuff.
You can edit the things directly in mapcontrib if you first connect your account, then click on a POI, then click on the little pencil.